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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Dale Mooney# | .5577 | 1982-1991 | |
| 2 | Tim Kennedy | .5512 | 1977-1990 | |
| 3 | Jason Miner | .5455 | 1962-1976 | |
| 4 | Will Jewell | .5415 | 1952-1959 | |
| 5 | Anastasio Martínez | .5360 | 1952-1963 | |
| 6 | Vincent Jarvis | .5184 | 1964-1978 | |
| 7 | Carlos González | .5046 | 1969-1980 | |
| 8 | Luis Hernández | .4971 | 1975-1984 | |
| 9 | Aberto Cambria | .4904 | 1915-1925 | |
| 10 | José Peña | .4761 | 1937-1946 | |
| 11 | José Hernández# | .4748 | 1982-1991 | |
| 12 | Claudio Moreno | .4730 | 1951-1964 | |
| 13 | Darrel Edmonds | .4716 | 1975-1984 | |
| 14 | Colin Wilkins | .4562 | 1963-1970 | |
| 15 | Eisaku Chouda | .4520 | 1930-1938 |
